import random

from django import forms
from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator
from django_redis import get_redis_connection

from web import models
from django.conf import settings
from utils.tencent.sms import send_sms_single
from utils import encrypt
from web.forms.bootstrap import BootStripForm


class RegisterModelForm(BootStripForm,forms.ModelForm):
    mobile_phone = forms.CharField(label='手机号', validators=[RegexValidator(r'^1[3-9]\d{9}$'), ])
    password = forms.CharField(label='密码', widget=forms.PasswordInput(), min_length=8, max_length=64, error_messages={
        'min_length': '密码长度不能小于8个字符',
        'max_length': '密码长度不能大于64个字符',
    })
    confirm_password = forms.CharField(label='重复密码', widget=forms.PasswordInput(), min_length=8, max_length=64,
                                       error_messages={
                                           'min_length': '密码长度不能小于8个字符',
                                           'max_length': '密码长度不能大于64个字符',
                                       })
    code = forms.CharField(label='验证码', widget=forms.TextInput())

    class Meta:
        model = models.UserInfo
        fields = ['username', 'email', 'password', 'confirm_password', 'mobile_phone', 'code']


    def clean_username(self):
        username = self.cleaned_data['username']
        exists = models.UserInfo.objects.filter(username=username).exists()
        if exists:
            raise ValidationError('用户名已存在')
        return username

    def clean_email(self):
        email = self.cleaned_data['email']
        exists = models.UserInfo.objects.filter(email=email).exists()
        if exists:
            raise ValidationError('邮箱已存在')
        return email

    def clean_password(self):
        pwd = self.cleaned_data['password']
        return encrypt.md5(pwd)

    def clean_confirm_password(self):
        pwd = self.cleaned_data['password']
        confirm_pwd = encrypt.md5(self.cleaned_data['confirm_password'])
        if pwd != confirm_pwd:
            raise ValidationError('两次密码不一致')
        return confirm_pwd

    def clean_mobile_phone(self):
        mobile_phone = self.cleaned_data['mobile_phone']
        exists = models.UserInfo.objects.filter(mobile_phone=mobile_phone).exists()
        if exists:
            raise ValidationError('手机号已注册')
        return mobile_phone

    def clean_code(self):
        code = self.cleaned_data['code']
        mobile_phone = self.cleaned_data.get('mobile_phone')
        if not mobile_phone:
            return code

        conn = get_redis_connection()
        redis_code = conn.get(mobile_phone)
        if not redis_code:
            raise ValidationError('验证码失效或未发送，请重新发送')
        redis_str_code = redis_code.decode('utf-8')
        if code.strip() != redis_str_code:
            raise ValidationError('验证码输入错误，请重新输入')
        return code


class SendSmsForm(forms.Form):
    mobile_phone = forms.CharField(label='手机号', validators=[RegexValidator(r'^1[3-9]\d{9}$', '手机号格式错误'), ])

    # 从视图中获取到request信息
    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request

    # 重点关注数据从哪里获取，以及数据在哪里，格式是什么？
    def clean_mobile_phone(self):
        mobile_phone = self.cleaned_data['mobile_phone']
        # 判断短信模版是否有问题
        tpl = self.request.GET.get('tpl')
        template_id = settings.TENCENT_SMS_TEMPLATE.get(tpl)
        if not template_id:
            raise ValidationError('短信模版错误')
        # 校验数据库中是否已有手机号
        exists = models.UserInfo.objects.filter(mobile_phone=mobile_phone).exists()
        # 判断是注册还是登录
        if tpl=='login':
            if not exists:
                raise ValidationError('手机号不存在')
        else:
            # 注册场景：检查手机号是否已存在
            if exists:
                raise ValidationError('手机号已存在')
        # 发短信&写如redis
        code = random.randrange(1000, 9999)
        sms = send_sms_single(mobile_phone, template_id, [code,5])
        if sms['result'] != 0:
            raise ValidationError('短信发送失败,{}'.format(sms['errmsg']))
        # 短信验证码写入redis
        conn = get_redis_connection()
        conn.set(mobile_phone, code, ex=60)

        return mobile_phone

class LoginSmsForm(BootStripForm,forms.Form):
    mobile_phone = forms.CharField(label='手机号', validators=[RegexValidator(r'^1[3-9]\d{9}$'), ])
    code = forms.CharField(label='验证码', widget=forms.TextInput())

    def clean_mobile_phone(self):
        mobile_phone = self.cleaned_data['mobile_phone']
        exists = models.UserInfo.objects.filter(mobile_phone=mobile_phone).exists()
        # user_obj = models.UserInfo.objects.filter(mobile_phone=mobile_phone).first()
        if not exists:
            raise ValidationError('手机号不存在')
        return mobile_phone

    def clean_code(self):
        code = self.cleaned_data['code']
        mobile_phone = self.cleaned_data.get('mobile_phone')
        if not mobile_phone:
            return code
        conn = get_redis_connection()
        redis_code = conn.get(mobile_phone)
        if not redis_code:
            raise ValidationError('验证码失效或未发送，请重新发送')
        redis_str_code = redis_code.decode('utf-8')
        if code.strip() != redis_str_code:
            raise ValidationError('验证码错误')
        return code


class LoginForm(BootStripForm,forms.Form):
    username=forms.CharField(label='邮箱或手机号')
    password=forms.CharField(label='密码',widget=forms.PasswordInput())
    code=forms.CharField(label='图片验证码')

    # 获取request数据
    def __init__(self, request,*args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request=request

    def clean_code(self):
        """ 验证图片验证码是否正确 """
        # 用户输入的验证码
        code = self.cleaned_data['code']
        # 从session中获取
        session_code =self.request.session.get('image_code')
        if not session_code:
            raise ValidationError('验证码已过期，请重新获取')
        if code.strip().upper() != session_code.upper():
            raise ValidationError('验证码输入错误')
        return code

    def clean_password(self):
        pwd=self.cleaned_data['password']
        return encrypt.md5(pwd)